Weighing scale



Feb. 19, 1929. 1,702,791

M. B. MILLS WEIGHING SCALE Filed Aug. 9, 1926 2 Sheets-Sheet l Feb. 19, 1929. 1,702,791

M. B. MILLS WEIGHING SCALE f Patenten Tab.v 19, 1929. `1,702,791

UNITED STATES PATENT OFFICE. l

MORTIMER IB. MILLS, OF CHICAGO, ILLINOIS, ASSIGNOR TO MILLS NOVELTY COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

WEIGHING SCALE.

Application filed August 9,\1`926.. Serial No. 128,253.

This invention relates particularly to a the connecting rod C downwardly. This o weighing scale; and the primary object is to connecting rod is joined by a'flexible member provide an improved scale of compact con- C to a rolling shaft l which is formed intestruction and greataccuracy. grally with the member D. The member C 5 While the invention is applicable to scales preferably is a thin flexible metal strap which of various kinds, it was primarily designed passes partly about the shaft 1 and is se- 55 for use in connection with a. platform scale cured thereto at the point la. The end-porfor weighing people. Scales of this chartions of the shaft l are supported by flexible acter are usually provided with coin-conmetal straps 2 whose upper ends are secured lo trolled means, enabling a customer to obtain at points 2 to a bracket 3 carried by the his weight, after first inserting a suitable Spider A3. The lower end-portions` of the 60 @om straps 2 are carried aroundthe shaft and The invention is illustrated in a simple emsecured to the shaft at points 2b (see Fig 4). bodiment in the accompanying drawings, eni- The straps 2 bear against the front face of bodied in a platform scale. The drawings do the bracket 3, and the shaft l thus has a rollnot, however, show the scale equipped with 111g Support on the bracket The member D 65 coin-controlled mechanism for controlling comprises an arcuate portion 4 constituting a the operation of the scale, inasmuch as such portion of a cylinder, this arcuate portion bemechansm forms n0 pal-t 0f the present ining carried by radial arms 4a rigidly secured 2o vention. to the shaft l.

In the drawingsd lhe connecting member E preferably eom- 70 Fig. 1 is a broken front elevational view of prises a thin flexible steel band having its the improved scale, the glass dial-plate being lower end connected at the point 5 with the removed; Fig. 2, a broken vertical sectional lower edge-portion of the member 4. The

View taken ag indicated at, 1in@ 2 of Fig- L; upper end of the strap E is connected to a clip Fig. 3, a broken view illustrating a slight 6, which, in turn, is connected with the lower 75 modification of the invention; and Fig. 4, a ends of the straps G2. The straps G2 and broken vertical sectional view taken as inalso the straps G preferably are thin flexidieated at line 4 of Fig. l. ble metal strips. o

In the embodiment shown in the dra-w- The levers Gare supported on the cams F ings, A designates a base from which rises by means of the straps G', the lower ends of 80 a tubular standard A equipped at its upper said straps being connected at points 7 with end with a easing A2 within which is mountthe levers. The upper portions of the straps ed a spider A3; B, a weighing platform G pass about the upper portions of the mounted on beams B housed in the base A; cams F andare secured to the cams at points C, a link connected with a member of the 8. The levers G are equipped at their upper 85 beams B; D, an arcuate actuating member portions with arcuate extensions 9 over connected with the link C; E, a flexible conwhich the upper portions of the straps G2 necting member connectedwith the member pass, the straps G2 being secured to the levers E; F, F, a pair of stationary cams rigidly at points l0. The extensions 9 curve inwardmounted on the lower portion of the front ly and downwardly from the main portions 90 face of the spider A3; and G, G, a pair of! of the levers G, and a space 11 between the weight-levers working on shifting fulcrums free ends of the members 9 affords a passage on the cams F, said levers being connected for the straps G2. The levers are fitted with by means of flexible members G with the weights 12.

cams F, and by means of flexible members G2 The construction described constitutes the 95 with the connecting member E. important mechanism of the invention. Any

Vhen a person steps on the platform B, suitable means may be employed for indithe lever B is thereby depressed, drawing eating weight. In the illustration given, a

pointer-shaft 13 is journalled in the spider lever 16 which is pivoted at 17 upon a sta-- tionary bracket 18. The free end of the lever 16 rests normally upon a projection 6? carried by the clip 6. When the clip 6 descends( in the Weighing operation, the lever 16 falls and actuates the shaft 13, thus turning the pointer 13 to indicate the weight on the dial. The shaft 13 is provided with a rearward extension 13c which is fitted with a groovcd wheel 13d to which is attached a cord 19 from which is suspended a weight 19% This weight is adaptedto return the pointer to the zero position when the weight is removed from the platform B.

The spider As is rigidly mounted in the casing A2 1n any suitable manner (not shown).

The operation may be stated briefly: When a person stands on the platform B, the beam-lever B is depressed, thus forming the connecting rod C downwardly. This causes the shaft 1 to roll downwardly along the front surface of the bracket 3, the-straps 2 supporting the shaft, however. As the shaft 1 rolls downwardly, the segmental portion 4 of the member D moves in the direction indicated by the arrow in Fig. 2. This causes lthe strap E to be drawn downwardly, the

arcuate member 4 rolling against the strap as the movement continues. Thus, the clip 6 is lowered, drawing the straps G2 downwardly and causing the levers G to swing about their fulcrums on the cams F. The fulcrum-points shift continuously, and it will be noted that` the shape of the cams is such that the actuated portions of the levers grow shorter and shorter, so that the'counterweights 12 act on constantly lengthening arms. That is, the counterweight arms continuously increase in length during the descent of the scale-beam B', while the arms actuated' from the scalebeam grow shorter and shorter.` By this means, it is possible to weight a heavy body on the platform B without using long leverarms and without vusing' heavy counterweights. The connecting straps G2 partially unwrap from the arcuate members 9 as the levers G swing upwardly in the direction indicated by the arrows in Fig. 1.

It will be noted that rolling movements are employed at all points, and thus the friction is reduced to a minimum. The cams Flnay be of any desired shape, depending upon the gain in leverage which may be desired.

In the modification shown in Fig. 3, the construction is the same as previously described, except that a counterbalance spring 12? takes the place of a counterweight 12, as the equivalent thereof; the remaining parts are designated b .reference characters correver G. Ordinarily, the use of a pair of such levers is preferred, however.

What I regard' as new, and desire to secure by Letters Patent, is: e

1. A weighing scale comprising a pair of cam-like stationary fulcrums, counterweighed levers adapted to roll on said fulcrums, straps connected with the upper portions of said levers, a strap connected with said first-mentioned straps, a swinging arcuate member with which said second-mentioned strap is connected, a load-platform, and means for transmitting stress from said load-platform to said arcuate member.

2. A weighing scale comprising a pair of cam-like fulcrums, straps secured thereto and extending about the curved surfaces of said fulcrums, counterweighed levers connected with said straps and adapted to roll on said fulcrums, arcuate extensions for said levers, straps secured to said levers and passing about said arcuate extensions, a rolling shaft equipped with an arcuate member having secured thereto a strap connected with said lastm'entioned straps, straps supporting said rolling shaft, a strap secured to and adapted to rotate said shaft, a load-platform, and connections between said load-platform and said last-mentioned strap.

3. -A weighing scale comprising a pair of cam-like fulcrums separated by a space, 1evers adapted to roll on said fulcrums with shifting fulcrum-points, said levers having at their upper portions inwardly and downwardly extending arcuate ortions adapted to worl; through the space between said camlike fulcrums, straps connected with said levers and extending over said arcuate extentensions, a rolling shaft equipped with an arcuate member, a strap secured to the lower portion of said arcuate member and connected with said first-mentioned straps, straps supporting said rolling shaft, an actuating 'strap connected with said rolling shaft, a load-platform, and connections between said load-platform and said last-mentioned strap.

4. A weighing scale comprisingl a pair of cam-like fulcrums, levers mounted to turn thereon with rolling contact, straps connected with said levers,'a load-platform, connecting means between said load-platform and said straps for transmitting stress thereto, a weight-indicating pointer having a shaft equipped with a wheel, a flexible member secured to sald' Wheel2 and a lever connected to Said flexible member adapted to actuate said shaft, said lever being adapted to follow downwardly during the Weighing operation.`

5. A Weighing scale comprising a, pair of supports, a pair of counterweight levers vfulcrumed on said supports, a load-platform and means for transmitting stress from said load platform to said counterweight levers comprisng a strap-supported shaft equipped With an arcuate member of larger radius than the shaft, a strap attached to said shaft and connected to said load-platform, a strap attached to said arcuate member, and means connecting said last-mentioned strap to said counterweight levers.

MORTIMER B. MILLS. 

